init

src/server/auth/config.ts

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+import { DrizzleAdapter } from "@auth/drizzle-adapter";
+import { type DefaultSession, type NextAuthConfig } from "next-auth";
+import DiscordProvider from "next-auth/providers/discord";
+
+import { db } from "@/server/db";
+import {
+  accounts,
+  sessions,
+  users,
+  verificationTokens,
+} from "@/server/db/schema";
+import { Adapter } from "next-auth/adapters";
+
+/**
+ * Module augmentation for `next-auth` types. Allows us to add custom properties to the `session`
+ * object and keep type safety.
+ *
+ * @see https://next-auth.js.org/getting-started/typescript#module-augmentation
+ */
+declare module "next-auth" {
+  interface Session extends DefaultSession {
+    user: {
+      id: string;
+      // ...other properties
+      role: UserRole;
+    } & DefaultSession["user"];
+  }
+
+  interface User {
+    // ...other properties
+    role: UserRole;
+  }
+}
+
+/**
+ * Options for NextAuth.js used to configure adapters, providers, callbacks, etc.
+ *
+ * @see https://next-auth.js.org/configuration/options
+ */
+export const authConfig = {
+  providers: [
+    DiscordProvider,
+    /**
+     * ...add more providers here.
+     *
+     * Most other providers require a bit more work than the Discord provider. For example, the
+     * GitHub provider requires you to add the `refresh_token_expires_in` field to the Account
+     * model. Refer to the NextAuth.js docs for the provider you want to use. Example:
+     *
+     * @see https://next-auth.js.org/providers/github
+     */
+  ],
+  adapter: DrizzleAdapter(db, {
+    usersTable: users,
+    accountsTable: accounts,
+    sessionsTable: sessions,
+    verificationTokensTable: verificationTokens,
+  }) as Adapter,
+  callbacks: {
+    session: ({ session, user }) => ({
+      ...session,
+      user: {
+        ...session.user,
+        id: user.id,
+      },
+    }),
+  },
+} satisfies NextAuthConfig;

src/server/auth/index.ts

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+import NextAuth from "next-auth";
+import { cache } from "react";
+
+import { authConfig } from "./config";
+
+const { auth: uncachedAuth, handlers, signIn, signOut } = NextAuth(authConfig);
+
+const auth = cache(uncachedAuth);
+
+export { auth, handlers, signIn, signOut };